wtw Cond 330i User manual

ba52310e03 03/2004
Handheld meter
pH 330i/340i
Operating manual
pH measuring instrument
AR
STO
CAL
RCL
M
O
PH
6
4
2
992
6
°
C
TP

Accuracy when
going to press The use of advanced technology and the high quality standard of our instruments are the result of continuous development. This may result
in differences between this operating manual and your instrument. Al-
so, we cannot guarantee that there are absolutely no errors in this man-
ual. Therefore, we are sure you will understand that we cannot accept
any legal claims resulting from the data, figures or descriptions.
Warranty We guarantee the instrument described for 3 years from the date of
purchase.
The instrument warranty covers manufacturing faults that are discov-
ered within the warranty period. The warranty does not cover compo-
nents that are replaced during maintenance work, e.g. batteries.
The warranty claim extends to restoring the instrument to readiness for
use but not, however, to any further claim for damages. Improper han-
dling or unauthorized opening of the instrument invalidates any warran-
ty claim.
To ascertain the warranty liability, return the instrument and proof of
purchase together with the date of purchase freight paid or prepaid.
Copyright ©Weilheim 2004 WTW GmbH
Reproduction in whole - or even in part - is prohibited without the ex-
press written permission of WTW GmbH, Weilheim.
Printed in Germany.

pH 330i/340i List of contents
3
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 SETs of equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.4 Jack field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2 Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 10
3 Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 Initial commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1 Switching on the measuring instrument . . . . . . . . . . . . . 13
4.2 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2.1 General information . . . . . . . . . . . . . . . . . . . . . . 14
4.2.2 Measuring the pH value . . . . . . . . . . . . . . . . . . 15
4.2.3 Measuring the ORP voltage . . . . . . . . . . . . . . . 17
4.3 Calibrating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.3.1 AutoCal TEC . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.3.2 AutoCal DIN . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.3.3 ConCal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.4 Saving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4.4.1 Saving manually . . . . . . . . . . . . . . . . . . . . . . . . 32
4.4.2 Saving automatically . . . . . . . . . . . . . . . . . . . . . 34
4.4.3 Outputting the data storage . . . . . . . . . . . . . . . . 36
4.4.4 Clearing the memory . . . . . . . . . . . . . . . . . . . . . 41
4.5 Transmitting data (only pH 340i) . . . . . . . . . . . . . . . . . . 42
4.5.1 Data transmission interval (Int 2, pH 340i) . . . . 42
4.5.2 Recorder (analog output, pH 340i) . . . . . . . . . . 44
4.5.3 PC/external printer (RS 232 interface, pH 340i) 45
4.5.4 Remote control (pH 340i) . . . . . . . . . . . . . . . . . 45
4.6 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
4.7 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
5 Maintenance, cleaning, disposal. . . . . . . . . . . . . . . . . 51
5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
6 What to do if.... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
7 Technical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

List of contents pH 330i/340i
4
8 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

pH 330i/340i Overview
5
1Overview
The compact precision handheld meter pH 330i/340i enables you to
carry out pH measurements rapidly and reliably.
The pH330i/340i handheld meter provides the maximum degree of op-
erating comfort, reliability and measuring certainty for all applications.
The proven MultiCal®calibration procedure and the special AutoRead
function support you in your work with the pH handheld meter.
Note
If you need further information or application notes, you can obtain the
following material from WTW:
lApplication reports
lPrimers
lSafety datasheets.
You will find information on available literature in the WTW catalog or
via the Internet.
1Keypad
2Sample display
3Jack field
AR
M
O
PH
6
4
2
992
6
°
C
TP
RCL
STO
CAL
1
2
3

Overview pH 330i/340i
6
1.1 SETs of equipment
The measuring instrument is also available as part of individual SETs
of equipment. You will find additional information on this and other ac-
cessories in the WTW catalog or via the Internet.
Set (sample configuration):
1 Measuring instrument, pH 330i/340i
2 Stand
3–KCI solution for electrodes
–50 ml pH buffer solution, STP 4
–50 ml pH buffer solution, STP 7
–Beaker, 50 ml
4 pH electrode
5 Plug-in power supply, optional (340i only)
5
4
3
2
1

pH 330i/340i Overview
7
1.2 Keypad
Key functions
RUN/ENTER
ARRCLCAL
STOM
Select the measuring mode <M>:
–pH value
–ORP voltage
Save a measured value
<STO>
Switch measuring instrument on/off
<ON/OFF>
Calibration of the current measured variable;
<CAL>
Display/transmit measured values
<RCL>
Activate/deactivate the AutoRead function
<AR>
Select the measuring mode,
Increase values, scroll
<▲>
Select the measuring mode,
Decrease values, scroll
<▼>
Confirm entries, start AutoRead
<RUN/ENTER>
M
STO
CAL
RCL
AR
RUN/ENTER

Overview pH 330i/340i
8
1.3 Display
1.4 Jack field
Warning
Onlyconnectelectrodestothemeasuringinstrumentthatcannotreturn
any voltages or currents that are not allowed
(> SELV and > current circuit with current limiting).
Nearly all electrodes - especially WTW electrodes - fulfill these condi-
tions.
1pH electrode or ISE single-rod measuring electrode/elec-
trode
2Reference electrode
3Plug-in power supply (pH340i only)
4Temperature probe
5Serial interface RS 232 / analog output (recorder) -
only pH 340i
%
°F
S
TempError
mg/L
% ppm
mol/L
ISE
RCL
8
8.
8
888
8
mV/pH
°C
LoBat
AutoCal DIN
CalError
ARng AR
AutoCal TEC
TP
1
UpH
Time
Baud
Day.Month No.
Ident
Year
Auto Store
ConCal
Status display
Meas. value display
Function and
temperature display
Sensor symbol
Ref
5
123
4

pH 330i/340i Safety
9
2 Safety
This operating manual contains basic instructions that you must follow
duringthecommissioning,operationandmaintenance ofthepHmeter.
Consequently, all responsible personnel must read this operating man-
ual before working with the measuring system. The operating manual
must always be available within the vicinity of the measuring system.
Target group The measuring instrument was developed for work in the field and in
the laboratory.
We assume that, as a result of their professional training and experi-
ence, the operators will know the necessary safety precautions to take
when handling chemicals.
Safety
instructions The individual chapters of thisoperatingmanualuse safetyinstructions such as the label shown below to indicate various hazards or dangers:
Warning
indicates instructions that must be followed precisely in order to avoid
the possibility of slight injuries or damage to the instrument or the envi-
ronment.
Further notes
Note
indicates notes that draw your attention to special features.
Note
indicates cross-references to other documents, e.g. operating manu-
als.
2.1 Authorized use
The authorized use ofthe measuring instrument consists exclusivelyof
the pH and ORP measurement in the field and laboratory.
Thetechnicalspecificationsasgiveninchapter7TECHNICAL DATA must
be observed. Only the operation and running of the measuring instru-
ment according to the instructions given in this operating manual is au-
thorized.
Any other use is considered to be unauthorized.

Safety pH 330i/340i
10
2.2 General safety instructions
This instrument is built and inspected according to the relevant guide-
lines and norms for electronic measuring instruments (see chapter 7
TECHNICAL DATA).
It left the factory in a safe and secure technical condition.
Function and operating
safety The smooth functioning and operational safety of the measuring instru- ment can only be guaranteed if the generally applicable safety mea-
sures and the specific safety instructions in this operating manual are
followed during operation.
The smooth functioning and operational safety of the measuring instru-
ment can only be guaranteed under the environmental conditions that
are specified in chapter 7 TECHNICAL DATA.
If the instrument was transported from a cold environment to a warm
environment, the formation of condensate can lead to the faulty func-
tioning of the instrument. In this event, wait until the temperature of the
instrument reaches room temperature before putting the instrument
back into operation.
Safe operation If safeoperationisno longer possible,theinstrumentmustbe takenout
of service and secured against inadvertent operation!
Safe operation is no longer possible if the measuring instrument:
lhas been damaged in transport
lhas been stored under adverse conditions for a lengthy period of
time
lis visibly damaged
lno longer operates as described in this manual.
If you are in any doubt, please contact the supplier of the instrument.
Obligations of the
purchaser The purchaser of the measuring instrument must ensure that the fol- lowing laws and guidelines are observed when using dangerous sub-
stances:
lEEC directives for protective labor legislation
lNational protective labor legislation
lSafety regulations
lSafety datasheets of the chemical manufacturers.

pH 330i/340i Commissioning
11
3 Commissioning
3.1 Scope of delivery
lHandheld meter, pH 330i or 340i
lPlug-in power supply, optional (340i only)
lOperating manual and short operating manual
l4 batteries, 1.5 V Mignon type AA (in the instrument)
3.2 Initial commissioning
Perform the following activities:
lSet the date and time
lConnect the plug-in power supply, optional (340i only)
Setting the date and
time 1Press the <M> key and hold it down.
2 Press the <ON/OFF> key.
The display test appears briefly on the display.
3Press the <RUN/ENTER> key repeatedly until the date ap-
pears on the display.
4 Set the date of the current day with <▲> <▼>.
5Confirm with <RUN/ENTER>.
The date (month) flashes in the display.
6 Set the current month with <▲> <▼>.
7Confirm with <RUN/ENTER>.
The year appears on the display.
8 Set the current year with <▲> <▼>.
9Confirm with <RUN/ENTER>.
The hours flash on the display.
10 Set the current time with <▲> <▼>.
11 Confirm with <RUN/ENTER>.
The minutes flash on the display.
12 Set the current time with <▲> <▼>.
13 Confirm with <RUN/ENTER>.
The instrument switches to the pH measuring mode.
14 Switch the instrument off using <ON/OFF>.

Commissioning pH 330i/340i
12
Connecting the plug-in
power supply
(340i)
You can either operate the measuring instrument with batteries or with
the plug-in power supply. The plug-in power supply supplies the pH
meter 340i with low voltage (12 V DC). This saves the batteries.
Warning
The line voltage at the operating site must lie within the input voltage
range of the original plug-in power supply (see
chapter 7 TECHNICAL DATA).
Warning
Use original plug-in power supplies only (see
chapter 7 TECHNICAL DATA).
Note
You can also measure without the plug-in power supply.
1Plug the jack (1) into the socket (2) of the measuring instru-
ment.
2 ConnecttheoriginalWTW plug-inpower supply(3)toan easily
accessible mains socket.
Ref
2
1
3

pH 330i/340i Operation
13
4 Operation
4.1 Switching on the measuring instrument
Note
The measuring instrument has an energy saving feature to avoid un-
necessary battery depletion. The energy saving feature switches the
measuring instrument off if no key has been pressed for an hour. The
energy saving feature is not active when the AutoStore function is ac-
tive.
Measuring instrument
340i The energy saving feature is also not active
lif the power is supplied by the plug-in power supply,
lif the communication cable and a PC with a running communication
program are connected,
lif the recorder cable is connected,
lif the printer cable is connected (for external printers).
1Press the <ON/OFF> key.
The display test appears briefly on the display.
Subsequently, the slope and asymmetry used appear for ap-
prox.onesecondoneaftertheother.Inaddition,thecalibration
procedure of the last calibration is shown (AutoCal TEC or
AutoCal DIN or no display in the delivery state or following ini-
tialization).
The measuring instrument then automatically switches to the
measuring mode that was last selected.

Operation pH 330i/340i
14
4.2 Measuring
4.2.1 General information
You can measure the following variables:
lpH value
lORP voltage
Preparatory activities Perform thefollowingpreparatoryactivitieswhen youwant tomeasure:
Warning
When connecting anearthed PC/printer, measurementscannot be per-
formed in earthed media as incorrect values would result. The RS 232
interface is not galvanically isolated.
Note
Incorrect calibration of pH electrodes leads to incorrect measured val-
ues. Calibrate regularly before measuring.
Temperature sensor You can measure with or without a temperature sensor. If a tempera-
ture sensor is connected, it is indicated on the display by TP.
Note
The measuring instrument automatically recognizes the type of the
temperature sensor used. Therefore, you can connect temperature
sensors of the NTC30 or Pt1000 type.
1Connect the electrode to the measuring instrument.
2 Adjust the temperature of the buffer solutions or test solutions,
or measure the current temperature, if you measure without a
temperature sensor.
3In conjunction with the electrode, check or calibrate the mea-
suring instument. How to calibrate is described in section 4.3.
4 Select the measuring mode with <M>.

pH 330i/340i Operation
15
The temperature measurement is absolutely essential for a reproduc-
ible pH measurement. If the measurement is made without a tempera-
ture sensor, proceed as follows:
4.2.2 Measuring the pH value
Setting the resolution The measuring instrumentshows thepH value with a resolution of 0.01
or 0.001. (Default setting is 0.01). To change the resolution, press the
<M> key while pressing the <RUN/ENTER> key.
1Measure the current temperature of the test sample using a
thermometer.
2 Enter the temperature on the instrument: Set the temperature
value of the test sample using <▲> <▼>.
1Perform the preparatory activities according to section 4.2.1.
2 Immerse the pH electrode in the test sample.
3Press the <M> key until pH appears on the status display. The
pH value appears on the display.
mV/pH
mol/L
8
Auto Store
TempError
RCL
LoBat
AutoCal DIN
CalError
ARng AR
AutoCal TEC
ConCal
Time
Baud
Day.Month No.
Ident
Year
1
U
%
°F
S
mg/L
% ppm
ISE
8
4
2
299
6
°C
TP
pH

Operation pH 330i/340i
16
AutoRead
(drift control) The AutoRead function (drift control) checks the stability of the mea- surement signal. The stability has a considerable impact on the repro-
ducibility of the measured values.
For identical measurement conditions, the following criteria apply:
Note
The current AutoRead measurement can be terminated at any time
(accepting the current value) by pressing <RUN/ENTER>.
Reproducibility Response time
Better than 0.02 > 30 seconds
1Call up the pH measuring mode with <M> and <▲> <▼> .
2 Activate the AutoRead function with <AR>.
The current measured value is frozen (hold function).
3Start AutoRead with <RUN/ENTER>.
AR flashes until a stable measured value is reached.
This measured value is transmitted to the interface.
4 If necessary, start the next AutoRead measurement with
<RUN/ENTER>.
5To terminate the AutoRead function: Press the <AR> key.

pH 330i/340i Operation
17
4.2.3 Measuring the ORP voltage
Inconjunctionwithan ORPelectrode,e.g.SenTixORP,themeasuring
instrument can measure the ORP voltage (U) of a solution.
Note
ORP electrodes are not calibrated. However, you can check ORP elec-
trodes using a test solution.
1Perform the preparatory activities according to section 4.2.1.
2 Immerse the ORP electrode in the test sample.
3Press the <M> key until U appears on the status display.
The ORP voltage (mV) of the test sample appears on the dis-
play.
4 Wait for a stable measured value.
/pH
ConCal
Auto Store
LoBat
AutoCal DIN
CalError
ARng AR
AutoCal TEC
8
pH
1
%
°F
S
Time
Baud
Day.Month No.
Ident
Year
RCL
TempError
mg/L
% ppm
mol/L
ISE
3
1
2
2
0
mV
°C
U
TP
17

Operation pH 330i/340i
18
4.3 Calibrating
Why calibrate? pH electrodes age.This changesthe asymmetry(zero point) and slope
of the pH electrode. As a result, an inexact measured value is dis-
played. Calibration determines the current values of the asymmetry
and slope of the electrode and stores them in the measuring instru-
ment.
Thus, you should calibrate at regular intervals.
When to calibrate? lAfter connecting another electrode
lWhen the sensor symbol flashes:
–after the calibration interval has expired
–after a voltage interruption, e. g. after changing the batteries
Calibration interval The calibration interval (Int 3) is set to 7 days in the factory. You can
select the interval in the range of 1 ... 999 days (see section
4.6 CONFIGURATION).
You can select between 3 calibration procedures:
AutoCal TEC is specially adapted to the WTW technical buffer solutions as a fully au-
tomatic two-point orthree-point calibration. The buffersolutions are
automatically recognized by the measuring instrument. Depending on
theinstrumentsetting(seesection4.6 CONFIGURATION),theinstrument
displays the relevant buffer nominal value or the current electrode volt-
age in mV. The calibration can be terminated after the first buffer solu-
tion. This corresponds to a single-point calibration. For this, the
instrument uses the Nernst slope (-59.2 mV/pH at 25 °C) and deter-
mines the asymmetry of the electrode.
AutoCal DIN is speciallyadapted tothe permanently programmed buffer solutions in
accordance with DIN19266 as a fully automatic two-point or three-
pointcalibration.Thebuffersolutionsareautomaticallyrecognizedby
the measuring instrument. Depending on the instrument setting (see
section4.6 CONFIGURATION),theinstrumentdisplaystherelevantbuffer
nominal value or the current electrode voltage in mV. The calibration
can be terminated after the first buffer solution. This corresponds to a
single-point calibration. For this, the instrument uses the Nernst
slope (-59.2 mV/pH at 25 °C) and determines the asymmetry of the
electrode.
ConCal This function is a conventional two-point calibration using two buffer
solutions (pH 7.0 ± 0.5 and any otherbuffer solution)or a single-point
calibration using any buffer solution and is used as a high-speed
method.

pH 330i/340i Operation
19
AutoRead When calibrating with AutoCal TEC and AutoCal DIN, the AutoRead
function is automatically activated.
The current AutoRead measurement can be terminated at any time
(accepting the current value) by pressing <RUN/ENTER>.
Displaying calibration
data Each time the instrument isswitched on,the calibration data are shown on the display for a short time (see section 4.1 SWITCHING ON THE MEA-
SURING INSTRUMENT). In order to view the calibration data, switch the
measuring instrument off and switch it on again.
Printing the calibration
record (340i) The calibration protocol contains the calibration data of the current cal- ibration. You can transmit the calibration protocol to a printer via the se-
rial interface (see page 40).
Note
You can automatically print a calibration protocol after the calibration.
To do so, connect a printer to the interface according to section 4.5.3
before calibrating. After a valid calibration, the record is printed.
Sample printout:
CALIBRATION PROTOCOL
02.03.99 14:19
Device No.: 12345678
Calibration pH
Cal time: 01.03.99 / 15:20
Cal interval: 7d
AutoCal DIN Tauto
Buffer 1 1.679
Buffer 2 4.008
Buffer 3 6.865
Buffer 4 9.180 *
C1 174.1 mV 25.0°C
C2 -133.3 mV 25.0°C
S1 -59.4 mV/pH
ASY1 - 4 mV
Probe: +++

Operation pH 330i/340i
20
Calibration evaluation After the calibration, the measuring instrument automatically evaluates
the current status of the electrode. The asymmetry and slope are eval-
uated separately. The worst evaluation appears on the display.
Preparatory activities
Display Asymmetry
[mV] Slope [mV/pH]
-15 ... +15 -60.5 ... -58
-20 ... +20 -58 ... -57
-25 ... +25 -61 ... -60.5
or
-57 ... -56
Clean the electrode according
to the electrode operating
manual
-30 ... +30 -62 ... -61
or
-56 ... -50
E3
Eliminatetheerroraccordingto
chapter 6 WHAT TO DO IF...
< -30 or
> 30 ... -62 or ... -50
1Switch on the measuring instrument with <ON/OFF>.
2 Connect the pH electrode to the measuring instrument.
3Keep the buffer solutions ready.
4 Adjust the temperature of the solutions and measure the cur-
rent temperature if the measurement is made without temper-
ature sensor.